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Stockholders' Equity, Stock Option Activity (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares [Abstract]      
Outstanding at beginning of period (in shares) 9,397    
Granted (in shares) 3,518    
Exercised (in shares) (1,064)    
Cancelled/forfeited/expired (in shares) (540)    
Outstanding at end of period (in shares) 11,311 9,397  
Exercisable at end of period (in shares) 6,071    
Weighted Average Exercise Price Per Share [Abstract]      
Outstanding at beginning of period (in dollars per share) $ 44.52    
Granted (in dollars per share) 48.40    
Exercised (in dollars per share) 17.78    
Cancelled/forfeited/expired (in dollars per share) 52.47    
Outstanding at end of period (in dollars per share) 47.85 $ 44.52  
Exercisable at end of period (in dollars per share) $ 46.83    
Average Remaining Contractual Term, Aggregate Intrinsic Value and Other [Abstract]      
Average remaining contractual term, outstanding at end of period 4 years 4 months 28 days    
Average remaining contractual term, exercisable at end of period 3 years 2 months 19 days    
Aggregate intrinsic value, outstanding at end of period $ 93,663    
Aggregate intrinsic value, exercisable at end of period $ 63,756    
Weighted average fair value of options granted (in dollars per share) $ 25.49 $ 25.42 $ 26.72
Intrinsic value of options exercised $ 34,800 $ 49,500 $ 28,000
Cash received from exercise of stock options $ 18,900 $ 21,200 $ 12,600
Weighted-average fair value of options exercised (in dollars per share) $ 50.50    
Unrecognized Compensation Expense [Abstract]      
Unrecognized compensation expense related to non-vested stock options $ 118,300    
Weighted average period for recognition 1 year 2 months 12 days